ASP.Net File Upload with CRC check

Is there a file upload control for ASP.Net which performs a client-side checksum calculation (CRC, MD5, etc) on the file contents and transmits the checksum to allow for server-side checksum validation?

I have looked through answers on several file upload questi开发者_如何学Pythonons, but did not find this feature mentioned anywhere.

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From javascript you won't be able to detect the size of a file in the client computer. Javascript runs inside a sandbox and cannot access local system files, which will be a ecurity violation.

You can use silverlight and can get the file size and calculate the sum. You can check this

Silverlight File Uplaod

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You'll need some client code to open your file, compute that check sum and to post it to your webserver with your file content; you can't do that with plain javascript, as you're not supposed to have access to your user filesystem.

But, just like @Dan Herbert commented out into your question, to use a client application like Flash, Java applet or Silverlight to execute that. I just wanted to make a more complete answer and to explain why you can't do that.